8371788588561 has 4 divisors (see below), whose sum is σ = 11162384784752. Its totient is φ = 5581192392372.

The previous prime is 8371788588557. The next prime is 8371788588587. The reversal of 8371788588561 is 1658858871738.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8371788588561 - 2² = 8371788588557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8371788588521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395298098091 + ... + 1395298098096.

It is an arithmetic number, because the mean of its divisors is an integer number (2790596196188).

Almost surely, 2^{8371788588561} is an apocalyptic number.

It is an amenable number.

8371788588561 is a deficient number, since it is larger than the sum of its proper divisors (2790596196191).

8371788588561 is a wasteful number, since it uses less digits than its factorization.

8371788588561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790596196190.

The product of its digits is 722534400, while the sum is 75.

The spelling of 8371788588561 in words is "eight trillion, three hundred seventy-one billion, seven hundred eighty-eight million, five hundred eighty-eight thousand, five hundred sixty-one".